Home » International DT466 » International DT466 – ENGINE SYMPTOMS DIAGNOSTICS – Problems and Conditions – Aerated Fuel Inspection

International DT466 – ENGINE SYMPTOMS DIAGNOSTICS – Problems and Conditions – Aerated Fuel Inspection

NOTE: If directed to this procedure from “Hard Start and No Start Diagnostics” section, go to “Alternate
Fuel Source Supply to Fuel Pump” (page 106) in this section.

CAUTION: Be sure to place a rag or suitable container under the fuel pressure test valve when bleeding the
fuel rail. Dispose of fuel in a correct container clearly marked DIESEL FUEL according to local regulations.

NOTE: Engine fuel can be a threat to the environment. Never dispose of engine fuel by putting it in the trash,
pouring on the ground, in the sewers, in streams, or bodies of water.

1. Valve
2. Center stem

1. Valve
2. Center section

NOTE: Engines are equipped with a fuel pressure test valve in the form of either a Shrader valve or a diagnostic coupling.
1. Check fuel pressure and aeration from fuel pressure test valve located at the front of the intake manifold.
2. Check fuel pressure and aeration from fuel pressure test valve located at the front of the intake manifold.

1. Quick disconnect check valve
2. Fuel test line
3. Fuel Pressure Gauge
4. Inline shut-off valve
5. Clear test line

NOTE: If the engine is equipped with a Shrader valve, use the Fuel Pressure Test Adapter.

NOTE: If the engine is equipped with a diagnostic coupling, adapt the Fuel/Oil Pressure Test Coupler to
the Fuel Pressure Gauge.

3. Connect Fuel Pressure Gauge with shut-off valve and clear 3/8” diameter hose to test valve.
4. Route the clear hose into a drain pan.
5. Start or crank the engine for 20 seconds. Measure fuel pressure with the shut-off valve closed. Open the shut-off          valve to check for aeration.

NOTE: Breaking any fuel system joint will induce air into the fuel system. The air should pass in a short period of time. As fuel pressure is relieved, a steady stream of fuel without air bubbles indicates the fuel is not aerated.
• If fuel pressure is in specification and fuel is not aerated, do not continue with this test.
• If the fuel is aerated, go to “Alternate Fuel Source Supply to Fuel Pump” (page 106) in this section.